rmol: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/rmol - from package: rmol

You may install the required package with command yum install {package}

Error in other languages:
rmol: bevel nie gevind nie
rmol: comandă negăsită
rmol: comando não encontrado
rmol: commande introuvable
rmol: command not found
rmol: käsku ei ole
rmol: không tìm thấy lệnh
rmol: komanda nerasta
rmol: Kommando nicht gefunden.
rmol: kommandot finns inte
rmol: komut yok
rmol: nie znaleziono polecenia
rmol: níor aimsíodh an t-ordú
rmol: no se encontró la orden
rmol: no s'ha trobat l'ordre
rmol: opdracht niet gevonden
rmol: parancs nem található
rmol: perintah tidak ditemukan
rmol: príkaz nenájdený
rmol: příkaz nenalezen
rmol: команда не найдена
rmol: командата не е открита
rmol: 命令找不到
rmol: コマンドが見つかりません